A survey of the state of Maine: in reference to its geographical features, statistics and political economy, Moses Greenleaf, 1829. (print, online)
Spec Coll HA416 .G8 1829
A gazetteer of the state of Maine, George Jones Varney, 1881. (Print, online, and Internet Archive.)
Maine: A Guide 'Down East', written by workers of the Federal Writers Project of the WPA, 1937. (print, online, and Internet Archive)
Main Ref F17.3 .F42
2d ed. Revision prepared by the Maine League of Historical Societies and Museums
Main Ref F17.3 .M3 1970
Public Documents of the State of Maine, 1840-1940
Governor's message and executive agency reports--Agriculture, Health, Transportation, etc.
For other Maine State Documents from 19th and early 20th century—use Compass and MaineCat to identify and locate.
Maine History Research Guide
Books, internet sites and other information available at Bowdoin.
Portland History at the Portland Public Library
"Portland Public Library is the top research and preservation resource for the history of the Greater Portland area." Also very strong in Maine historical newspapers.
Catalog of the Maine Historical Society
"At this time, the majority of our library holdings are electronically cataloged, including general history and Maine history books (town, school and church histories, vital records, etc), as well as some manuscript, map, and pamphlet collections." (January 2014) The MHS has a particularly strong collection of historical newspapers.